Thats interesting however:
"Ultimately, hydrogen is no more or less dangerous than other flammable fuels including natural gas and gasoline. In some cases, what makes hydrogen different from those hydrocarbon fuels actually leads to it having greater safety benefits over gasoline and natural gas."
Green hydrogen benefits aside, one of the common myths that lead to some questioning H2 safety is the notorious Hindenburg disaster, which occurred in New Jersey, back in 1937.
After decades long debate and research, it is now believed that while the German passenger airship was docking during an electrical storm on the fateful day of the explosion, an electrical discharge from the clouds ignited the skin of the airship. This resulted in the ship’s hydrogen bags igniting.
However, what caused the large and deadly fire was not the hydrogen, which burned rapidly and safely above the ship’s occupants, but the dark iron oxide and reflective aluminum paint that coated the ship’s surface. Those components were highly flammable and burned at a high energetic rate once they caught fire.
I thought this Video was interesting partially the comment about "inside the rear window the temperature rose only 13 degrees"
I knew about the Hindenberg stuff. I don't suppose the passengers and crew cared about the precise cause. I am less concerned about the relative flammability of hydrogen. The key problem is ensuring that hydrogen doesn't leak.
Imagine filling your hydrogen car (or MH); then, when you want to drive it next morning, discovering that the tank is empty. Next, imagine that happening with your domestic boiler. Tricky wee molecules versus mediocre engineering.